[ Vocabulary ]
__________ is a technique in which scientists calculate the age of a sample based on the amount of remaining radioactive isotopes it contains
A. isotope dating
B. retroactive dating
C. radioactive dating
D. index fossilization

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Gerund or InfinitivesAbstract NounsFuture Tense - will and going toWill and Going toCompliment, Congratulation, and HopeRelative Pronouns with PrepositionsSimple Present and Past TensesFormal & Informal WordsNouns as AdjectivesSimple and Progressive Verb TensesOther quiz:
Some vs. Any › ViewHer teacher was angry because she didn’t do … homework.
a. some
b. any
Homonyms › View
Plants benefit from a daily spray of ___.
a. missed
b. mist
He had no food, the poor ___.
a. retch
b. wretch
Vocabulary › View
Agreement between two or more sides in which each side gives up some of what it wants.
A. compromise
B. cabinet
C. bicameral
D. amendment